diff --git a/src/overlay/docs/partials/overlay-constrain-source.mustache b/src/overlay/docs/partials/overlay-constrain-source.mustache
index cd220dbd5ca..af67fefd7a3 100644
--- a/src/overlay/docs/partials/overlay-constrain-source.mustache
+++ b/src/overlay/docs/partials/overlay-constrain-source.mustache
@@ -1,4 +1,4 @@
-<div class="overlay-example" id="overlay-example">
+<div class="overlay-example yui3-skin-sam" id="overlay-example">
     <div id="constrain-box"></div>
 </div>